Grain washing machine



FIG. 1 is a perspective view of a grain washing machine showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is right side view thereof;

FIG. 6 is top plan view thereof; and,

FIG. 7 is bottom plan view thereof. 

CLAIM The ornamental design for a grain washing machine, as shown and described. 